Efforts to explain this sudden reduction in child deaths appeared to draw a blank.

所有寻找造成儿童死亡率突然降低的努力都一无所获。

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Mary had feared the day she would draw a blank during a presentation.

玛丽担心自己在演讲时头脑短路了。

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Sometimes I need to draw a few lines or some text on an image or a blank canvas.

有时，我需要在一张图像或一块空白画布上绘制几根线条和一些文本。

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Today, religious elements of Britain's founding myth draw blank stares.

ECONOMIST: Bagehot

Perhaps you draw a blank every time you introduce a new colleague to co-workers.

FORBES: 6 Easy Ways To Remember Someone's Name

Or that reference sites like Answers.com and Wikipedia, with thousands of preprogrammed responses, also draw a blank?

FORBES: Should You Trust The Source?